Re: [EnergyPlus_Support] Inconsistency with idf version update from 8.2 to 8.3 version

Marko

From:"Jason Kirkpatrick jason.alan.kirkpatrick@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Date:Tue, Sep 1, 2015 at 21:33
Subject:Re: [EnergyPlus_Support] Inconsistency with idf version update from 8.2 to 8.3 version

Marko,

The error you are showing usually occurs when a thermal zone signals it needs cooling, it tries to open the chilled water valve to provide cooling, but the chilled water plant is off or unavailable and so the valve opening has the action of heating up the air instead of cooling it, so the simulation throws the error as far as I understand.,

I would suggest using the same availability schedule for the chilled water plant as well as the air systems to ensure the chillers can operate with the air systems. You likely have a night cycle setting which turns on the AHU when the plant is unavailable. Try setting this to 'stayoff' and this might fix your issue.

Hope this helps, good luck,

Jason

On Tue, Sep 1, 2015 at 3:23 AM, Jim Dirkes jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

Marko,
It is possible that the conversion to 8.3 included some changes that you are not aware of, made by the conversion program. It may be worth comparing the IDFs side-by-side. (winmerge.org does this nicely if you don't have a similar program already.)

If that does not reveal a problem, I recommend asking the E+ Help Desk.

On Tue, Sep 1, 2015 at 5:53 AM, marko.ignjatovic1980@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

Dear colleagues,

I would like to know if any of you ran into the following:

My model worked fine in version 8.2.0 and when updated to version 8.3.0 it generated many severe errors all of them associated with Cooling Coil Control Logic (
Controller:WaterCoil,
AHU CC Control, !- Name
Temperature, !- Control Variable
Reverse, !- Action
Flow, !- Actuator Variable
AHU CC Outlet, !- Sensor Node Name
AHU CC CW Inlet Node, !- Actuator Node Name

** Severe ** FindRootSimpleController: Controller error for controller = "AHU CC CONTROL"
** ~~~ ** Environment=PMVCHECK, at Simulation time=07/14 06:00 - 06:10
** ~~~ ** Controller function is inconsistent with user specified controller action = "" action
** ~~~ ** Actuator will be set to maximum action
** ~~~ ** Controller control type=Temperature
** ~~~ ** Controller temperature setpoint = 12.80 [C]
** ~~~ ** Controller sensed temperature = 26.41 [C]
** ~~~ ** Controller actuator mass flow rate set to 0.92 [kg/s]
** ~~~ ** Controller actuator temperature = 33.24 [C]
)
I put output variables on the actuator node name and cooling supply output node and got strange results in the form that chilled water temperature increases (up to 35oC), although SetPointManagers are set for these temperatures to be in range 6-10oC.

Any help is more than welcome.

P.S. With all these inputs, the version 8.2.0 was working fine and the setpointManagers were followed.

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James V Dirkes II, PE, BEMP, LEED AP
CEO/President
The Building Performance Team Inc.
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